The Cry Babies quietly enjoy their holidays in Tutti Frutti Bay on their sun loungers and wearing their new swimsuits. Sidney wants to play, but the others prefer to keep sunbathing. So, Sidney decides to go and play alone while the others relax. When she reaches the shore, she discovers, in the middle of the sand, a mysterious bottle with a message inside... It is an invitation to the Tropical Fest on Tropical Island! Sidney is excited and tells the others, but Lady, Ella and Fancy want to stay on their sun loungers, so they decide not to go. This decision makes Sidney angry, and she decides to go alone. Sidney ventures on a boat and goes to Tropical Island. But, she hasn't realised that she has forgotten the map... Will she find the island and arrive in time to enjoy the Tropical Fest?